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The service-oriented architecture (SOA) has become an unifying technical architecture that can be embodied with Web service technologies, in which the Web service is thought as a fundamental building block. This paper proposes a simulation modeling approach based on stochastic Petri nets to estimate the performance of SOA applications. Using the proposed model it is possible to predict resource consumption and service levels degradation in scenarios with different compositions and workloads. A case study was conducted to validate the approach and to compare the results against an existing analytical modeling approach.